29 lines
1.2 KiB
TypeScript
29 lines
1.2 KiB
TypeScript
import { SignedZeroExTransaction } from '@0x/types';
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import { BigNumber } from '@0x/utils';
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import * as ethUtil from 'ethereumjs-util';
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import { hashUtils, SignedTECApproval, signingUtils, TECSignatureType } from './index';
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export class ApprovalFactory {
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private readonly _privateKey: Buffer;
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constructor(privateKey: Buffer) {
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this._privateKey = privateKey;
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}
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public newSignedApproval(
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transaction: SignedZeroExTransaction,
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approvalExpirationTimeSeconds: BigNumber,
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signatureType: TECSignatureType = TECSignatureType.EthSign,
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): SignedTECApproval {
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const approvalHashBuff = hashUtils.getApprovalHashBuffer(transaction, approvalExpirationTimeSeconds);
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const signatureBuff = signingUtils.signMessage(approvalHashBuff, this._privateKey, signatureType);
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const transactionHash = hashUtils.getTransactionHashHex(transaction);
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const signedApproval = {
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transactionHash,
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approvalExpirationTimeSeconds,
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transactionSignature: transaction.signature,
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approvalSignature: ethUtil.addHexPrefix(signatureBuff.toString('hex')),
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};
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return signedApproval;
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}
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}
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